Die



c. M. BREHM I 2,272,082

Feb. 3, 1942.

'DIE

Filed July 19, 1939 4 Sheets-Sheet 1 Feb.4 3, 1942.

- c; M. BREHM DIE Filed July 19, 1939 4 sheets-sheet 2k Eeb.3,1942. QM,BEHM 2,272,082

DIE

Filed July 19,1939 4 Sheets-Sheet 5 Patented Feb. .1942

" feminin; man spannen; ons, ja, 'rire 'sunn-` rroduets, company;-,'Springeld Ohioga corporationluf om?y I' .v .Si

` "limitation Julyfiaissaseii No. 285,383 1v maar, (.Qlmiwr 'Ihisinvention relates to apparatus forttrimming formed articlesv and moreparticularly to die construction having relativelymovable cooperatingwhich shift withrespect -toone another to trim a partiallyfformed blank.

Onel object 'of the invention is the provisionl of a trimming die of the.character mentioned embodying a plurality of demembers which areadapted to .be brought together and movedsimultaneously in onedirection. and. to have ya rel-` ative shifting movement during ysuchsimultaneous movement, one ofthe die members having a blank engagingportion which is arranged to be tilted during the shifting movement. totrim the blank. f Another object of the invention ,is the provision of atrimming die one portion of whichv is shifted relatively to another byacam block, and embodying cooperating parts adapted totrim the blankalong a curved line. n

n Another object of the invention is the provision of a trimming die ofthe character mentioned and including a blank-engaging part whichy isarranged to tilt or rock on one `die member, yin the trimming operation,such part 2l? vbeing slidably guided on a cooperatingfpart carriedby'the other die member to give -an arcuately curved trim line.l

Another object of the invention is the provision of a cam-operatedtrimming die having relatively shiftable parts one ofwhich carries a"blank-clamping and'r gaging member which is mcilntedfor tiltingmovementalong a 'curved Other objects and advantages of the invention will' beapparent from the following description, the appended claims and theaccompanying drawings in which a preferred embodiment o the inventionhas been illustrated. Y Inthe drawings,

F18. 1 is a verticalvsection ytaken.centrally through a trimming dieembodying the 'present invention, showing the upper and vbers in engagedposition;

Fig.- 2 is a vertical sectional view through the lowervdie memsectionplane of Fig. 1;

Fig. 3is a horizontal'section o! Fig. 1; f

l'gaging and trimming member;-

` and trimming member;

Fig. 7. is` avv detail view vof lower.- blanlr-en- .Figa 'isa sidevelevation of themen-engaging Fig. 911s a"'perspective"view of thetrimmed Fig. 10 isa Figs. 10Afto `.10174; are `enlarged sectional viewsoperative positionsiand Fig. y11 isasectiona1--viewsimi1ar to Fig.iohbut .takenthroughthe dies at right 'angles to thev section of FigrlO.f

l ReIerring ,more particularly yto 'the drawings there is illustrated apreferred form of die construction adapted to Atrim edges of apartlyformed blank or shell such asia: sheet metaldrawvrlugar/stamping, `thetrimming operation being "effected by relatively movable portions of apunch .III whichfis' ladapted to be moved up and-.down Abytheyslidevorram of, a power press, and a -female diemember Il Vwhichis carried on the press bed. IAny suitable form of press may be useditooperatethe die members. .As herein shown the Iblank-engagingportionsofthe die are soxformed asr to trim the'side-walls or edge portions of asectionv of a sheet metal watch-case.y The punch lllcomprises a suitablecarrying memberullwhich is adapted tobeboltedvto vthe slide o1' Yalpress and which carries 4a plate I3 secured tol member I2 vby means ofbolts I5. `Removably Abolteci'to thelower side of the plate I3 is atrimming part I8 having trimmingedges I1 trimming die on a line-at rightangles to the and I8 adalfitedy to trinithe edgesof a blank I9 vby meansof arelative shifting movement that is caused` take pl'ace-betweentheyblank and trimming member .Il with respect to `theftrimming kpart I6,in a'cyclefofoperations. .As shown, the f two opposed trimming edges I'I.are straight and produce straight lines-,of ytrim on the oppositeendsfof the blank, andthe trimming edges I 8 are arcuatelywcurved totrim ythe blank( along curved lines at the twoother sides. u

Suspended below theA trimm' gpartIx. is va blank. gagingandgclampingmember 20 adapted .v Flg. 5 `is a section throughthe-'cam'block on` to enterthe blankto. b e trimmed-and force the blankdwn in .the lower die memberas the upper. and lower die mein'ibers arebrought together. 'Ihis blank clamping and-gaging memberqlll on its'lower .side 'is` kformed' to the shape of thelower surface ofthe1blank','that is, for .an arcutely broken sectionall viewl lthrough ltheY ltrimming die in ari-:intermediate stage of operav v v curvedwatch-case section, it is curved about a center 22, and the uppersurface of the blank gaging member is concentrically curved and slidesagainst the correspondingly curved lower surface of the trimming partI6. A iiexible cable or resilient wire support 23 is suitably fastenedat its lower end to member 20 and permits relative sliding movementbetween the blank gaging member 20 and the lower side of the trimmingpart Il while holding the gaging member 2l up against the lower side ofthe trimming part. 'I'he upper end of the flexible cable 23 is carriedby a' stud 24 adjustably held in the plate I3.

The upper die member Il is also provided with pressure pins 2l xed onthe lower side of the plate I3 and adapted to press down against theupper surface of a plate forming the upper portion of movable cam block26 which forms a portion of the lower die member, these pins causing thelower die member to descend with the upper die member as soon as the dieis closed.

The cam block 26 of the lower die member is normally maintained in itsuppermost position illustrated in Figs. l and 2 by means of springs 21and 28 or other equivalent yielding means. As herein shown there arefour springs 21 arranged on the upper side of a pressure plate 3|. Rods32 are loosely carried within the springs 21, the upper ends of the rodsbeing supported in flanged portions 34 of a part 14 secured to the camblock, and the lower ends of the rods operating through holes 35 in thepressure plate and carrying pins 36 which limit therelative downwardmovement of the plate 3 l The springs 28 engage against the lower sideoi the plate 3| and against nuts 31 carried by the lower ends of foursupporting rods 33 which are carried in fixed relation with the lowerside of a support 40, which is adapted to be readily installed in apress. l

Carried by the support 40 are cams 4I and 42 engaging the cam sides 43and 44 respectively of the cam block. These cam sides are so formed asto cause the cam block to shift laterally back and forth in a pluralityof directions and in a predetermined sequence of shifting movements, asthe cam block 26 is moved downwardly in the opening 45 in the supportingmember 40 and against the action of the springs 21, 28, such downwardmovement being produced by the force applied through the pins 25 of theupper die member.

Mounted in the cam block is a blank-clamping member 46, the shape of itsupper surface corresponding withthe shape of the lower side of theblank. The clamping member 46 is yieldingly urged upwardly as will bepresently described, and is slidably carried for endwise movement in alower blank-engaging and trimming member 41. This blank trimming memberis provided with shearing edges 48 which are straight edges adapted tocooperate with the shearing edges l1 of the upper trimming part I6. Themember 41 is also provided with curved trimming edges 49, (see Fig. '1)and as will be apparent from Fig. 1 these trimming edges 49 engage theouter side of the blank at the trim line and cooperate with the trimmingedges I8 when the member 41 shifts to the right or left as viewed inFig. 1 with respect to the descending trimming part `I 6. Such shiftingmovement is imparted to the trimming block by means of the cam portions44A to 441. The cam portions 43A, 43D, and 43G of the cam block producethe back and forth shifting movement; towards the right and left asviewed in Fig. 2. However during this shifting movement of the camblock, the blank trimming member 41, instead of having a merereciprocating movement with the cam block, is caused tovtilt or rockabout the center 22 in order that the shearing edges 48 may be movedacross the shearing edges i1. The member 41 is provided with opposedcurved pressure surfaces 5I fitting with the parallel vertical surfaces52 on the top plate portion of the cam block, and is provided with anarcuately formed surface 53 having a center of curvature at 22, andslidably engaging'against the correspondingly curved surfaces 34 on thelower` side of the trimming part I3. As the member 41 is moved to theright or left as viewed in Fig. 2'it therefore slides along the curvedguide surfaces I4 and is compelled to rock about the center 22 so as toswing the blank about a iixed center whose radius corresponds to theradius of the curved trim line of the blank. It will thus be apparentthat by shifting the cam block back and forth in a plurality ofdifferent shifting directions, the straight edges of the blank may betrimmed at opposite sidesof the blank, and the curved edges may betrimmed at the other opposing sides by a tilting or rocking movementimparted to the blank and a mere reciprocating movement imparted to theblank, respectively.

Reference to the construction of the cam block and the several cams-asshown in Figs. 10 and ll, and to the detailed sequence of movements asrepresented in Figs. 10A to l0I, will show the way in which the entireperipheral edge of the blank is trimmed upon a downward stroke ofmovement of the cam block.

In Fig. 10, the two cams 42 at opposite sides of the cam block are shownin relation to the block which has been depressed to an intermediateposition. In Fig. 1l which is a section through the cam block at rightangles to that of Fig. 10, the two cams 4i are shown in relation to thecam block which is depressed to the same intermediate position. Theworking plane or axis of all four cams is the same and is indicated bythe line O O'. It will be noted that each of the fourfaces of the camblock has a surface at a neutral level which provides for the cam blockbeing held in a central location, and that when there is a rise on oneof the faces there is a corresponding drop on the opposite face, toeffect controlled movements of the cam block, trimming member 41, andthevblank from one side to the other of its neutral position in the twodirectionsat right angles to each other. Trimming member I6 has adownward movement only and hence a relative shifting between trimmingmembers I6 'and `41 occurs which results in the trimming of the entireperipheral edge of the' blank. l

At the beginning of the downward travel of the trimming member i6 butbefore any downward movement of thecam block has taken place, all fourof the cams occupy neutral positions and the cam block is thus heldcentrally. In this position'clamping member 20 may be readily engagedwithin the blank under the guiding action of supporting member 23.`

As thecam block moves on a stroke of movement it traverses a. 'series ofzones or positions indicated by the letters A to H in Figs. l0 and 1l,these several positions occurring in sequence as the cam block movesprogressively with relation to the working axis of the cams. Figs. 10Ato 10I show the corresponding positions .of the trimming members and theblank in each of these positions and4 indicate the sequence ofoperations which results in the trimming oi' the entire blank. In thefirst or A position, the line designated A coincides with the workingaxis O-O oi the several cams. Cam face 44A is at a 'neutral level and so-is cam face 43A. Consequently the cam block and member 41 willoccupyaneutral position with respect to the trimming part il, which as shownin Fig. A, stands centrally of the blank I9. I v

In the next or B position, with the cam block moved downwardly to alevel where line B coin-I cides with axis O-O, the rise 44B of the camblock causes a shift thereof-to the right as shown in Fig. 10 resultingin a displacement of the trimming memberv 41 with respect toy trimmingpart I6 to cause the'trlmming of the left-hand curved edge of the blank,as shown in 10B.

In the next or C position, the block has moved.

to such point that line C coincides with v'axis O O', and cam surfacer44C on the opposite side of the block causes movement of the cam blockand member 41 in the opposite direction or to the left as shown in Fig.10. This results in the trimming of the right-handarcuate side edge ofthe blank as shown in Fig.'10C.

In the D position, cam surface 44D is at the neutral level and hence theblock is returned to a central position 'in' the -plane of Fig. 10.However in the plane at right angles thereto as shown in Fig. 11,elongatedcam face 43D hasv caused movement'of the cam block and member41 in such manner as to cause'trimmng part I5 to trim one of thestraight edges of the blank. In the course of such movement member 41 isgiven the arcuate or rocking motion as previously described. As shown inFig. 10D, member 41 has been moved downwardly and hence the upper nstraight edge' of the blank has been trimmed.

This leaves at the upper edge of the blank'only ming of the upperleft-hand cornerfof the blank. This is indicated in Fig. 10E, and is theactual position which the cam block is shown as occupying in Figs. 10and 11. i

In the F position, cam face 44F causes movement of the member -41 to theleft while itis still heldin a position of downward displacement by camface 43D. This results in the trimming of the upper right-hand corner ofthe blank as indicated in` Fig. 10F. l

A 'similar sequence of operations then4 takes-n place with respect tolthe lower edge of the blank. In the G position elongated cam face 43Gcauses upward movement of member 41, while it is held centrally by camvface 44G`at the neutral level and as shown in Fig. 10G this results vinthe trimming of the lower straight` edge of the blank, leaving only thetwo lower corner portions` to be trimmed.

In the H position. while the block andy member 41 are held with thisupward displacement by cam face 43G, cam face 44H eiects shiftingthereof to the right, to thereby trim the lower left-hand corner of theblank as shown in Fig. 10H.l

In the nal'position, cam face 44I effects movement of the cam blockand'member 41 to the left and causes the trimming of thelowerI righthandcorner of the blank as indicated in Fig. 10I.v

The reverse sequence occurs upon the return or upward stroke of movementof the cam block.

It will be understood that the reference to right carried by severalpins 64 having curved upper v f each other.

and lett, and upper. and lower portions of the blank are used forpurposes of descriptiononly, and in reference to the arrangement of theparts as shown in Figs. 10 and 11, theactual movements occurring in thetwo The lower trimming member 41 is yieldingly sides engaging the lowerhardened plate portion 65 of member`41. These pins 64 are slidablyreceived in cylindrical vertical sockets provided in the cam block,andsprings 66 arranged inthese hsockets normally press thepins 64upwardly and thus maintain the member 41 with a predetermined forceagainst the lower side of thel trimming part I6 during operation. 'Anextension at the end of plate ssiimits the upward travel of in Fig. 2.This slide line and rocking surface are provided on a supporting block69 which is secured by means of a bolt to the"v upper end of a f rod' 1|which `extends down through bushings 12 and 13 in a guide housing' 14,"the latterV being secured to and movable with the cam block. A guidepiston '10 carried by the upper end of the rod'1l nts loosely in thepassage of thecam block and holds the rod from turning. 'A spring 15engaging kthe lower wall'16 of this housing presses against a iiange 11on the rod 1| and normally acts to maintain a yieldingupward pressure onVthe rod 1I in order that a predetermined yielding pressure force may beexerted by the clamping member 46 against the blank. The spring 15,

when the die is open, holds the clamping member 46 somewhat elevatedwith respect to the member 41, and under such conditions the member 41is also held up by springs somewhat above its.

position shown' in Fig. 2, with' respect to the' cam block. When' theupper die memberdescends the upper clamping and gaging member 26 entersthe blank and forces the lower clamping member 46 downwardly and'` atthe same time the lower side of the upper trimming partl I6 engages andpushes'downwardly against the lower trimming part 41. The pins 25 thenengage against the upper side of the cam block and these parts all thendescend further during the shifting movementk imparted by the cams. Whenthe upper die member is'raised` andk released from the lower die member,the spring 15 acting against the lower clamping'member 46 causes thetrimmed'blank to be raised or partially ejected from the lower trimfming member 41. The extent to which the 4member 46 is elevated in themember 41 is determined by adjusting a stop nut 19 which is threaded onthe lower end of the rodA 1| and which engages against thelower side ofa sleeve bearing against the lower surface 8| of the guide housing 14.The lower end of the sleeve 80 is surrounded by a collar 82 having a pinB3 which operates along the slot 84 toprevent its rotation. A spring 85acts against the top of this collar and causes it to lock over nutV 19to, hold it against movement. Relative rotational movements between therod 1| and. they sleeve 80 are prevented by akey 81.

While the form ofv apparatusherein described constitutes a preferredembodiment .of the invention, it is to"be understood that fthe invention'is notlimited to this precise form of apparatus,

directions at right angles to and that changes may be made thereinwithout departing from the scope of the invention which is dened in theappended claims.

What is claimed is:

1. In combination, a plurality of cooperating die members adapted to bebrought together and movesimultaneously in one direction in translation,means for shiftingsaid die members relatively during such simultaneousmovement, and a blank-engaging member supportedfor tilting movement inone of said die members as the die members shift.

2. In combination, a plurality of cooperating die members adapted to bebrought together and move simultaneously in one direction, means forshifting said die members relatively during such simultaneous movement,la blank-engaging member supported for tilting movement in one of saiddie members as the die members shift, and means on the other die membercontrolling the tilting movement of said blank-engaging member.

3. In combination, ilrst and secondcooperating die members adapted to bebrought together and move simultaneously in one direction and to shiftrelatively during such simultaneous movement, said first die membercomprising a support, a movable block adapted to be moved in one diyrection by said second die member, cam means for shifting the block onthe support relatively to said second die member, and a blank-engaging`member operatively mounted in one of said die members for tiltingmovement by shifting of the block and having shearing edges for trimmingthe blank during such tilting movement.

4. In combination, rst and second cooperating die members adapted to bebrought together and move simultaneously in 'one direction and to shiftrelatively during such simultaneous movement. said iirst die membercomprising a support, a movable block adapted to be moved in onedirection by said second die member, cam means for shifting the block onthe support relatively to said second die member, a blank-engagingmember operably mounted in one of said die members for tilting movementby shifting of the block and having shearing edges for trimming theblank during such tilting movement, and a blank clamp- -ing and gagingmember mounted in the other die member for tilting movement with saidblankengaging member.

5. In combination, rst and second cooperating die members adapted to bebrought together and move simultaneously in one direction and to shiftrelatively during such simultaneous movement, said first die membercomprising a support, a movable block adapted to be moved in onedirection by said second die member, cooperating cams on said supportand movable block for shifting the block back and forth on the supportas the block moves in said one direction, additional cam means on saidsupport and block for shifting the block on the support in a secondshifting direction as the block moves in said one direction. and ablank-engaging member operably mounted in one of said die members forsliding and rocking movement on the other die member by shiftingmovement of the block and having shearing edges for trimming the blank.

6. In combination, a plurality of die members adapted to be broughttogether and move simultaneously in one direction and to shiftrelatively during such simultaneous movement, comprising a support, amovable block, a movable die member for moving the block in onedirection, cam

tively to the movable die member, and a blankengaging member operablymounted in said block for tilting movement by shifting of the block andhaving shearing means cooperating with th movable die member.

7. In combination, a plurality of cooperating die members adapted to bebrought together and moved simultaneously in one direction and to shiftrelatively during such simultaneous movement, comprising a. support, amovable block, a movable die member for moving the block in onedirection, cam means for shifting the block` on the support relativelyto the movable die member, a blank-engaging member mounted in said blockfor tilting movement about an axis by shifting of the block and havingshearing edges for trimming the blank, said movable die member having acurved guide surface concentric with said axis and controlling therocking movement of said blank-engaging member.

8. In combination, a plurality of die members adapted to be broughttogether and moved simultaneously in one direction and to shiftrelatively during such simultaneous movement, comprising a support, amovable block, a movable die member for moving the block in onedirection, cam means for shifting the block in one direction on thesupport relatively to themovable die member, additional cam means forshifting the block in a second direction. and a blank engaging memberoperably mounted in said block for tilting movement by shifting of theblock in said one direction and for rectilinear movement by shifting ofthe block in the second direction and hav-v ing shearing meanscooperating with the movable die member for shearing the blank insuchtilting and rectilinear movement.

9'. In combination, a plurality of die members adapted to be broughttogether and move simultaneously in one direction and to shift in aplurality of directions with respect to one another during suchsimultaneous movement, comprising .a support having an aperture, amovable block operable along said aperture, a movable die member formoving the block along said aperture and having shearing means fortrimming the blank. yielding means operableon saidblock against theaction of said movable die member, cooperating cam means on said blockand support for shifting the block relatively to the movable die member,a blank-engaging member operably mounted in said block for tiltingmovement 4by shifting of the block in one direction and for bodilymovement only by shifting of the block in the second direction,said-'blank-engaging member having shearing means cooperating with themovable die member. and having a cylindrically curved surface slidablyengaging a complementary surface on said movable die member.

l0. In combination, a plurality of die members adapted to be broughttogether and move simultaneously in on'e direction and to shiftrelatively during such simultaneous movement, comprising a support, amovable block, a movable die member for moving the block in onedirection, cam means for shifting the block on the support relatively tothe movable die member, a blankengaging member axially movable in saidblock, spring means urging said blank-engaging member outwardly, saidmember having opposed surfaces adapted to rock on the block when theblock is shifted and having shearing edges cooperating with the movabledie member for shearing the blank, a blank clamping and gaging membermovably supported by said movable die member to shift with the block,and a cooperating blank clamping member axially slidable in saidblank-engaging member and supported for rocking movement therewith.

11. In combination, a pair of cooperating die members adapted to bemoved simultaneously in a working stroke of movement, trimming memberscarried respectively by said dies and shiftable relative to each otherto trim a blank, means operative during said movement of said dies foreffecting 'shifting and relative displacement of one of said trimmingmembers from a central position back and forth in the plane normal tothe direction of said stroke ofv movement, and additional meansoperative during said stroke of movement for shifting said trimmingmember in a curved path of movement in a direction at right angles tothe shifting movement caused by said rst shifting means.

12. In combination, a pair of cooperating die members adapted to bemoved simultaneously in a Working stroke of movement, trimming memberscarried respectively by said dies and shiftable relative to each otherto trim a blank, means operative during said movement of said die's foreffecting shifting and relative displacement of one of said trimmingmembers from a central position back and forth in the plane normal tothe direction of saidv stroke of movement, and means operative duringdisplacement 'of said trimming member in either direction away from saidcentral position for shifting Asaid member in a direction at rightangles to said rst shifting movement.

13. In combination, a pair of cooperating die members adapted to bemoved simultaneously in a working stroke of movement, trimming memberscarried respectively by said dies and shiftable relative to each otherto trim a blank, means operative during said movement of said dies foreffecting shifting and relative displacement of one of said trimmingmembers from a central position back and forth in the plane normal tothe direction of said stroke of movement, and means operative duringdisplacement of said trimming member away from said central position forshifting said trimming member in a curved path of movement in adirection at right angles to said rst shifting movement.

14. In combination, a pair of cooperating die members adapted to bemoved simultaneously in a working stroke of movement, trimming memberscarried respectively by said dies and shiftable relative to each otherto trim a blank, means operative during said movement of said dies foreffecting shifting and relative displacement of one of said trimmingmembers from a central position back and forth in the plane normal tothe direction of said stroke of movement, means operative for shiftingsaid trimming member back and forth in a direction at right angles tosaid first shifting movement, and additional means for effectingdisplacement of said trimming member away from said central positionconcurrently in both said directions at right angles to each other.

15. In combination, a pair of cooperating die members adapted to bemoved simultaneously in a working stroke'of movement, trimming memberscarried respectively by said dies and shiftable relative to each otherto trim a blank, means operative during said movement of said dies foreffecting shifting and relative displacement of one of said trimmingmembers from a central position back and forth in the plane normal tothe direction of said stroke of movement, means operative for shiftingsaid trimming member back and forth in a direction at right angles tosaid first shifting movement, additional means for effectingdisplacement ofsaid trimming member away from said central positionconcurrently in both said directions at right angles to each other, andmeans carried respectively by said pair of die members 'and supportedthereby for shifting movement along with said trimming members forclamping and holding said blank during the trimming operation.

16. Trimming dies of the character described adapted for trimming ablank one edge of which is curved comprising a pair of trimming members,means fory supporting said trimming members providing for bringing saidtrimming members together and for simultaneous movement thereof, meansfor causing relative shifting of said trimming members during suchsimultaneous movement, the surfaces of said trimming members beingcooperatively curved in one direction to correspond with the curvaturedesired in the curved edge of said blank, a blank engaging membermovable with one of said trimming members, and means for effectingrocking movement of said blank engaging member and its said trimmingmember during relative shifting of said trimming members.

17. yTrimming dies of the character described adapted for trimming ablank one edge of which is curved comprising a pair of trimming members,means for supporting said trimming members providing for bringing saidtrimming members together and for simultaneous movement thereof, meansfor causing relative shifting of said trimming members during suchsimultaneous movement, the surfaces of said trimming members beingcooperatively curved in one direction to correspond with the curvaturedesired in the curved edge of said blank, a member engaging one face ofthe -blank and participating in the movement' of one of the trimmingmembers, a second blank engaging member for engaging the opposite sideof the blank, and means for yieldably supporting said second blankengaging member to provide for rocking movement thereof concurrentlywith the movement of said first mentioned blank engaging member duringrelative shifting of said trimming members.

CHARLES M. BREHM.

